„in general relativity, the future light cone is the boundary of the causal future of a point and the past light cone is the boundary of its causal past.“ [wikipedia.org] This feed lists the stars in your personal light cone.

Coming: Chi Draconis (3 weeks away) Chi Draconis is 26.3 light years away and only 3 weeks from the outer surface of your light cone – your ever-growing sphere of potential causality – which began its expansion from Earth on your birthday.